Which of the following is a basic requirement of single-group cohort designs?
a) A sample that maintains its status on the characteristic of interest over time
b) Assessments of different people about the same subject
c) Assessments occurring at two or more points in time
d) A sample that may serve as its own control
Question 2
How do case-control and cohort designs differ?
a) In case-control, the groups are studied prospectively, but in cohort designs, the groups are studied retrospectively.
b) In case-control, only one group is studied, but in cohort designs, more than one group is studied.
c) In case-control, the groups are selected on the basis of an outcome that has already occurred, but in cohort designs, the groups are selected before the outcome has occurred.
d) In case-control, the groups are selected before the outcome has occurred, but in cohort designs, the groups are selected on the basis of an outcome that has already occurred.
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